Most fire emergency lighting uses lead-acid dry batteries.
Lead-acid battery (VRLA) is a battery whose electrodes consist mainly of lead and its oxides, and the electrolyte is a solution of sulfuric acid. In the discharged state of a lead-acid battery, the main component of the positive electrode is lead dioxide and the main component of the negative electrode is lead; in the charged state, the main components of the positive and negative electrodes are both lead; sulfate.
Electrochemical reaction in the electrode
The electrochemical reaction formula of valve-regulated lead-acid battery is as follows. Charging involves connecting an external DC power supply to the battery for charging, so that electrical energy is converted into chemical energy and stored. Discharge is the release of electrical energy from the battery to power external devicesernes.
When the VRLA battery charge reaches its peak, the charging current is only used to break down the water in the electrolyte. At this time, the positive electrode of the battery produces oxygen and the negative electrode produces hydrogen. . The gas will overflow the battery, causing electrolysis. The liquid is reduced and water must be added from time to time.
On the other hand, at the end of the charge or under overload conditions, the charge energy is used to break down the water. The oxygen generated by the positive electrode reacts with the spongy lead from the negative electrode, leaving some. of the negative electrode in an undercharged state, preventing the negative electrode from being fully charged. Generation of hydrogen gas.
Where is the main valve of the emergency light in the water tank?
No, as long as the original circuit is broken, the emergency light will turn off by itself.
Advantages of diesel generator sets
1. Multiple levels of single machine capacity and easy configuration The single machine capacity of Binxiang generator sets ranges from a few kilowatts to tens of thousands. kilowatts Depending on its use and charging conditions, the optional capacity range is wide and has the advantage of adapting to different electrical load capacities. When using diesel generator sets as backup and standby power, one or more units can be used, and the installed capacity can be flexibly configured according to actual needs.
2. The unit is lightweight and flexible. installation
The supporting equipment of the generator set is relatively simple, with less auxiliary equipment, small size and light weight. Taking the high-speed green oil engine as an example, it generally weighs 8-20kg/h. kW, while qThe steam generator is smaller than the diesel engine. The size of the set is more than 4 times larger. Thanks to this feature of the diesel generator, it is flexible and easy to move.
Diesel generator sets used as independent primary power sources mostly adopt independent configurations, while standby or standby diesel generator sets are usually used in conjunction with transformation and distribution equipment energy, because diesel generators are generally not connected to the grid. municipal power grid Parallel operation, and the unit does not require sufficient water source (diesel engine cooling water consumption is 34-82 L/ 3. High thermal efficiency and low fuel consumption The effective thermal efficiency of diesel engines is 30%. 46%, that of high-pressure steam turbines is 20% to 40%, and that of gas turbines is 20% to 30%, it can be seen that the effective thermal efficiency of the diesel engine is relatively high, so its consumption fuel is low. 4. Start quickly andIt can quickly reach full power. Starting a diesel engine usually takes only a few seconds. Under emergency conditions, it can be brought to full load within 1 minute under normal working conditions; to full charge in 5 to 10 minutes, while Yanqi power station generally requires 3 cents from start-up to full charge. The diesel engine shutdown process is also very short and it can be started and stopped very easily. Therefore, the diesel generator set isvery suitable as a backup or emergency power supply. s. simple to operate and easy to maintain As long as the general personnel who have carefully read the unit instructions can successfully start the diesel generator set and carry out daily maintenance work on the unit. If the unit fails, it can be repaired by on-site method, which requires less repair personnel and is more convenient to repair. 6. The overall cost of building a power plant and producing electricity is low 6. p> 7. ](Compared to dams, steam turbine cylinders equipped with boilers and larger fuel preparation and water treatment systems, diesel power plants occupy a small area, are built quickly and have low costs investment. According to relevant statistics, compared to 7](electric power production, wind, solar and other renewable energy, as well as nuclear and thermal power generation, the overall construction and power generation cost is the lowest. The lower right or lower left side of the water reservoir. The automobile water tank mainly consists of the radiator core, water pipes, cooling air blades, upper water tank and lower water tank. The upper water tank is located on the radiator. , and the water pipe connects the upper water tank to the water tank below the radiator. Air flows inside the core and air passes outside the water tank core. Hot coolant becomes cold due to heat dissipation in the air, and hot coolant becomes cold due to heat dissipation in the air. cold air heats up because it absorbs the heat emitted by the coolantement. The water tank is therefore a heat exchanger. The car's water tank valve is located on the bottom right or bottom left of the water tank, this varies depending on the model. The car's water tank, also called the radiator, is the main component of the car's cooling system; its function is to dissipate heat in the water jacket and flows to the radiator. water jacket to achieve the effect of heat dissipation and temperature regulation